<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>v-for指令</title>
</head>

<body>
    <div id="app">
        <input type="button" value="添加数据" @click="add" />
        <input type="button" value="移除数据" @click="remove" />
        <ul>
            <li v-for="(item,index) in arr">
                {{index + 1}}一线城市:{{item}}
            </li>
        </ul>
        <ul>
            <li v-for="item in vegetables" v-bind:title="item.name">
                {{item.name}}
            </li>
        </ul>
    </div>
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                arr: ["北京", "上海", "广州", "深圳"],
                vegetables: [
                    { name: "白菜" },
                    { name: "萝卜" }
                ]
            },
            methods: {
                add: function () {
                    this.vegetables.push({ name: "花菜" })
                },
                remove: function () {
                    this.vegetables.shift()
                },
            }
        })
    </script>
</body>

</html>